Add op gen tool to generate C++ classes for Operations.
Add op gen tool to generate C++ classes for Operations.

Create tblgen based tool to generate the C++ Op definitions. The modelling is
currently simple (ops, attributes, properties) with the printer/parser/verifier
the bodies of those functions and builders being very explicit.

PiperOrigin-RevId: 217150213

frreiss/tensorflow-fred,paolodedios/tensorflow,freedomtan/tensorflow,petewarden/tensorflow,xzturn/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aldian/tensorflow,adit-chandra/tensorflow,karllessard/tensorflow,Intel-Corporation/tensorflow,ppwwyyxx/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,renyi533/tensorflow,renyi533/tensorflow,gunan/tensorflow,tensorflow/tensorflow,cxxgtxy/tensorflow,adit-chandra/tensorflow,gunan/tensorflow,adit-chandra/tensorflow,DavidNorman/tensorflow,aam-at/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,ppwwyyxx/tensorflow,xzturn/tensorflow,annarev/tensorflow,karllessard/tensorflow,xzturn/tensorflow,annarev/tensorflow,jhseu/tensorflow,karllessard/tensorflow,adit-chandra/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,xzturn/tensorflow,petewarden/tensorflow,ppwwyyxx/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aam-at/tensorflow,aldian/tensorflow,annarev/tensorflow,petewarden/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,DavidNorman/tensorflow,sarvex/tensorflow,arborh/tensorflow,gunan/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,DavidNorman/tensorflow,yongtang/tensorflow,DavidNorman/tensorflow,Intel-tensorflow/tensorflow,jhseu/tensorflow,yongtang/tensorflow,ppwwyyxx/tensorflow,frreiss/tensorflow-fred,paolodedios/tensorflow,gautam1858/tensorflow,renyi533/tensorflow,freedomtan/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,freedomtan/tensorflow,adit-chandra/tensorflow,annarev/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,adit-chandra/tensorflow,annarev/tensorflow,jhseu/tensorflow,ppwwyyxx/tensorflow,aam-at/tensorflow,sarvex/tensorflow,yongtang/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,yongtang/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,arborh/tensorflow,arborh/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,petewarden/tensorflow,jhseu/tensorflow,tensorflow/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,cxxgtxy/tensorflow,davidzchen/tensorflow,jhseu/tensorflow,petewarden/tensorflow,sarvex/tensorflow,arborh/tensorflow,adit-chandra/tensorflow,yongtang/tensorflow,sarvex/tensorflow,freedomtan/tensorflow,cxxgtxy/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,davidzchen/tensorflow,renyi533/tensorflow,DavidNorman/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-Corporation/tensorflow,karllessard/tensorflow,aam-at/tensorflow,ppwwyyxx/tensorflow,arborh/tensorflow,aldian/tensorflow,aam-at/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,arborh/tensorflow,arborh/tensorflow,aam-at/tensorflow,Intel-Corporation/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,freedomtan/tensorflow,arborh/tensorflow,Intel-Corporation/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aldian/tensorflow,arborh/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,arborh/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gunan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,paolodedios/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,gunan/tensorflow,jhseu/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,freedomtan/tensorflow,gautam1858/tensorflow,aldian/tensorflow,jhseu/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,Intel-Corporation/tensorflow,aldian/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,jhseu/tensorflow,xzturn/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,sarvex/tensorflow,DavidNorman/tensorflow,gunan/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tenso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